Sebastian Vettel said Ferrari had much "homework" to do after a team orders controversy capped a disappointing weekend at the 1,000th Formula One grand prix in China.
The Italian marque have shown superior straight-line speed this season, but Mercedes have taken first and second in all three races so far in a run that has surprised even championship leader Lewis Hamilton.
The reigning world champion seized control of the drivers' standings with victory ahead of team-mate Valtteri Bottas in Shanghai on Sunday, while Ferrari's challenge dissolved behind them.
Ferrari's Vettel was third but Charles Leclerc finished fifth after the 21-year-old rising star was controversially ordered to make way for his senior team-mate, a four-time world champion.
Vettel bristled at questions over the team orders to Leclerc, but much of his frustration will stem from Ferrari's continuing inability to get the best out of their car.
"In terms of calls from our pit wall today, the priority always lies within the team and Charles and I are both aware we are driving for the team," said Vettel, 31.
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"We can do our own race but first of all we have to ensure Ferrari is in a position to fight with its rivals.
"I think we have a good car and we are still not able to unlock its potential completely." Team principal Mattia Binotto made clear before the race that Vettel remained the priority over the talented but inexperienced Leclerc.
The plan was to put pressure on the Mercedes duo at the front, but Vettel failed to make inroads and Leclerc was caught by Red Bull's Max Verstappen who split the Ferraris to come fourth.
- Mercedes 'over-delivering' -
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